Master Lock Combination Padlock
What it is: The Master Lock Combination Padlock is a maximum-security padlock with an electronic interface.
Why it's awesome: Master Lock claims that this padlock is easier to use than standard locks, and you can program it for up to three guests with unique passwords. You also get access to the Master Lock Vault, where you can securely store documents and other files online with 256-bit SSL data encryption.
Where to buy: Master Lock